Disabling anonymous enumeration of SAM Accounts

Hackers will often probe machines on the Internet for a list of their Users (SAM Accounts) and Shares (Shared folders and Printers). You can prevent this by Enabling "Additional restrictions for anonymous connections".

1.) Click on "Start" -> "Programs" -> "Administrative Tools" -> "Local Security Policy"

2.) Navigate to the "Security Options" folder in the left pane.

Local Security

3.) Double click on the "Additional restrictions for anonymous users" in the right pane, and choose "Do not allow enumeration of SAM accounts and shares".

Restrictions on anonymous users

4.) Click on the "OK" button.